Blocking system configuration is not nice in that it limits freedom, but I think an employee must take responsibility when his tools don't work as expected and

Blocking system configuration is not nice in that it limits freedom, but I think an employee must take responsibility when his tools don't work as expected and fix it at his own expense or just not take the chances and use the standard system. We had one employee who got distracted into his own geeky pursuits and changed his tool settings frequently with no apparent benefit to the development roadmap. In conclusion I think you have a valid right to set certain standards, and may provide freedom to change but at the developers responsibility, and take measures if things are inclined to get out of control.